Leaky Diaper at night

Almost EVERY night my lo wakes up motn with wet jammies. His diaper leaks. I have tried going up in size, switching diapers and changing him in motn. Any BTDT moms have advice? Have your lo's had leaky diaper issues like this?

We also use Pampers Seaddlers and never had a problem. The amount that it's holding it actually pretty crazy! We did switch to Pampers nighttime diapers because the Swaddlers would smell HORRIBLE in the morning. Not that I wasn't going to change her right away, but I felt bad that she stunk.

for the last 2 weeks we have been trying the Pampers 12 hour over night diapers with no luck. Last night I changed lo at 8:30 and put him to bed and by 5:30am he had leaked through the diaper again. I'm returning the diaers today and I'll try the swaddlers to see if they are any better. Thanks for all the imput!